I printed the fact sheet for the Dantes principles of Statistics and have been going point by point looking each topic up. I ran accross a topic that I couldn't find anywhere. It's under probability, "compatible and incompatible events" Is anyone familier with that? It probably is no big deal....just wondering if there is a formula that I need for it.There seems to be a never ending list of formulas to memorize for this exam

! Well, thanks everybody!